Cutter-head



E. S. SHIM-ER;

CUTTER HEAD. APPLICATION FILED FEB. 3, I920.

Patented Aug. 3, 1920.

2 SHEETS-SHEET 1.

M b m|m k 1:; w i s Z 3] vwenkw 1 UNITED STATES-PATENT OFFICE.

ELMER S. SHIMER, OF MILTON, PENNSYLVANIA, ASSIGNOR TO SAMUEL J. SI-IIMER &: SONS, INC., OF MILTON, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

Specification of Letters Patent.

CUTTER-HEAD.

Patented Aug. 3, 1920.

Application filed February 3, 1920. Serial No. 356,108.

To all whom it may concern:

Be it known that I, ELMER S. SHIMER, a citizen of the United States, residing 'at Milton, in the county of'Northumberland and State of Pennsylvania, have invented certain new and useful Improvements in Cutter-Heads, of which the following isa specification.-

My invention relates to an improvement in cutter heads. r

There are several objects in view, one of which is the provision of a cutter head of a maximum degreeof efliciency in the performance of its work, with the least possible amount of trouble and danger to the machine operator.

Another object is to provide a cutter head of such a construction and a knife of such a form that the grinding'for sharpening is all on the front bevel and throughout the full thickness of the knife and as a result the cutting edge is always gaged with perfect precision as a part of the sharpening of the knife. i

A further object is to provide a cutter head for endurance, that is in which the cutting edge can be made ,more durable than heretofore. In cutter heads hitherto in use it has been difiicult if not impossible to secure a favorable cutting edge for endurance, for the-reason that the edge of the knife came so near the square of thehead that it produced a thin cutting edge thatwas frail especially in working hard woods, but in this present invention the knife edge is set well back from the square of the head, which automatically changes the angle at which the edge of the knife is presented to the board, about twenty degrees, thus providing a more durable working knife edge.

Still another object is to provide a cut ter head for the cutting of molding in which the back of the cutting edge remains unchanged in a given knife while the sharpeningall takes place upon the front bevel thus providing uniformity of cut throughout the use and life ofa given knife and not requiring anything of the machine operator in the way of molding his ownknives as has frequently been the custom.

With the foregoing and other important objects in view my present invention consists in features of construction which will be fully described. and set forth in the i; singular.

claims.

In the accompanying drawings,

Figure 1, is a longitudinal section through the cutter head,

Fig. 2, is a transverse section,

Fig. 3, is a fragmentary view from one end of the cutter head, and

Fig. I, is adetail.

The body 1, of the cutter head is counterbored through the longitudinal center 2, in the usual manner, to receive the shaftynot shown, and in cross section it is more or less rectangular in form, in the construction shown, although it is understood that this depends on the number of knives that the head has, which in this particular instance are four, but the number of knives is obviously subject to variation. In this way two or more head sides are presented, according to the number of lmives employed on a given cutter head. Each head side is longitudinally grooved to form a track 3, and fitted'to these tracks are the slidable knife clamps 4, 5, in pairs, there being preferably two pairs of the clamps for each'knife. The two members of each clamp are substantially alike except that one member has a threaded hole 6, and the other member has a threadless hole 7, and

the screw 8, is swiveled in the threadless hole 7 and threaded into the threadedhole 6, so that the turning of the screw 8, moves the inner clamp member, in or out, according to the way the screw is turned. The clamp members 4, 5, are fashioned at the opposite edges to lit the track or way 3, and the upper edges of the clamps have dovetailed jaws 9, which face each other and are adapted to receive and clamp a portion of the knives therebetween. These dove-- tailed jaws 9, are made to ride back and forth upon the head sides 10, which latter also form support for the bases of the knives. The bevel guide 11, is formed at the forward edge of each head side 10 as an integral part thereof, constituting a fixed rib or gage, against which the knife is snugly set up and clamped. r

The knives 'areof peculiar design and form the subject matter for a companion application, and yet they are with the cutter head designed to go together and since the knives illustrated are all alike in form and dimensions, in the further description they will be referred to, in the main, in the The numeral 12, represents the knife. It

i has its back or outer surface 13, fashioned to forwarder cutting edge of the knife is bev- ,c onform to the molding designto' be cut, 7 and starting back 'a' predetermined distance.

from the cutting edge the back of the knife is beveled, as at 141, to save unnecessary weight and also to provide clearance that maybe necessary, to, prevent the heel of beveling off of the molded portion ofthe back commences at awplace on the knife back where its further use would render it unsafe, thjusi automatically providing .a means to signify to the-oper'ator that the knife is worn'out, I On the underside or base of the knife the dovetailed-webs 15, preferably two in num-' ber, are formed integral and extend in the direction of'the travel of the knife, and the eled throughout its thickness, including the webs as at 16, andthis bevel 16, precisely corresponds in angle, tothe angleof bevel guide 11, which forms. a fixedrib or gage therefor, inthe setting of the knife, and this gaging continues withprecision, throughout the-use of the knife. In other words the grinding'of the cutting edge of; the knife eX tend'sito the'webs and upon the same angle throughout, and always to fit the bevel guide 11.. r

The clamps 4, 5, are so disposed that their jaws 9, embrace and in fact clamp the webs 15, of the knives, against which they are drawn and heldrigidlyjby the screws 8, which it'hasbeen explained turn freely in one member and'are threaded in the other member. In this simple manner it is possibleto'quickly clamp orunclamp the knife, by applying awrench first at one end of the cutter head andthen at the' other end. V

Thedeptli of cut in this knife is provided fortby a thickening'of the knife, thereby dding'awaywithmuch of the work'and effort that" heretofore was, required of the operator himself, but with this tool becomes a standardizedv article-for its particular work. The-arrangement of the'knives is compact, as instead of -having to project inches beyond the headsides, my present arrangement does not require that, and conse quently' as an agent of safety: alone it adds much tothe comfort of the machine operator.

. The usual clearancespaces'16, are pro- I vided inthe surface ofthe-cutter head} 51 claim-z 7 i 1 The combination with the body portion of a cutter head including head sides in which tracks or ways are formed and having a bevel guide adjacent thereto, of a knife provided with dove-tailed webs on the'base,

the forward edge of the knife including the webs being beveled so that the edge fits the when the base rests upon the adjacent head side.

The combination with the body portion of a cutter head including he'adsides in which tracks or ways are formed,a-nd pro vided with bevel guides as a part of the head sides, of knives having beveled forward edgesadapted to rest upon said head sides and'bevelguides and provided with webs on their under sides, and clamps slidable' in the tracks or ways having jaws to engage and hold the webs'therebetween'.

4. The combination with the body portion of a cutter head including head sides in which tracksflor Ways are formed, and provided with bevel guides as a part of the head sides, of knives having beveled fforwar'd edges-having dove-tailed webs on their under sides adapted to extend in the direction of rotationof the cutter head and to rest upon the head sides, clamps adjustable in the tracks or ways, andmeanseXtending to the opposite ends of the'body portion and con nectedto the clamps for locking-the clamps to-the webs; Y V

'5. The combination with the body portion of 'acutter head includinghead sides in which tracks or. ways are formed, andprovided with bevel guides as apart'of the head side's, of knives having beveled forward edges having dove-tailed V webs on their under sides adapted to rest upon the head sides, clampsconsistingeach of two members fitted to slide and adapted to be adjusted in said tracks or ways, one of said clamp members having a' threadle'ss and theother a'--threaded hole and eachmember' having a dove-tailed jaw between which the webs are received and rigidly clamped, and screws extending through the members having the threa'dless holes and screwed into the members having the threaded holes with the outer ends'there of accessible to a tool whereby they are adapted to beturned'to clamp orunclamp the jaws.

6. The combination with the'body portion of a cutter-head, including headside'sand provided" with concaved clearance spacesbe tween said sides,- one edgeof'each head side beveled, of knives having beveledforward edges which conformto and-fit the beveled portion of the head sides, and adjustable means connected with the head sides for securing the cutters thereto.

7. The combination with the body portion of a cutter head including head sides in which tracks or ways are formed, of knives, dove-tailed webs on their bases and their forward edges beveled through the webs,each head side having a beveled guide adjacent to the track or way corresponding in lIlOllIlfia; tion with the forward edge of the knife and against which the latter is adapted to rest while the webs rest upon the head sides, clamps fitted and adapted to slide and be adjusted in the tracks or ways and having dove-tailed jaws to receive and rigidly hold the webs, the clamps each comprising two members, and screws swiveled to one of said members and screwed to the other for locking and unlocking the clamps.

In testimony whereof I afiix my signature. 20

ELMER S. SHIMER. 

